Inside the park there is no signal per se. You can at different times of the day while on the beach or in the wooded area get a 1-2 bar signal that will down load your messages or email. There is not constant signal anywhere in the park, but at the small store in from of the park thee is enough of a signal to communicate. No streaming anywhere. Many people go down by the store when they need to check email messages.
We were at Cape Disappointment State Park no reception at all. I dont even think they know what 4 G is. Once you get out of the park its ok, it depends on where your at. Hopefully this helps.
Thanks! Your answer is awaiting moderation.